The 1966 Twenty Cent was minted in Canberra and London. Look closely at the water swirl that ends in a point next to the platypus' head on the reverse. It is supposed to have no gap (or a very small gap) between the swirl and the head on the London coin, and show a distinct gap on the Canberra minted coin. However if the strike is slightly weaker on the London minted coins then there can be a small gap present and the coin must be examined closely to be sure of the mint of origin.
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